BORDEN, J.
The issues in this certified appeal are whether the Appellate Court properly concluded that: (1) the trial court acted improperly in excluding the testimony of a defense expert witness, due to a violation of a sequestration order, but its ruling was harmless; and (2) the trial court acted properly by permitting the state to present certain forensic evidence in rebuttal but refusing to allow the defendant to present surrebuttal [713]*713evidence.1 The defendant, Scott Cavell, appeals from the judgment of the Appellate Court affirming his conviction, after a jury trial, of sexual assault in the first degree in violation of General Statutes § 53a-70.2 Because we agree with the decision of the Appellate Court on both of these certified issues, we affirm the judgment of the Appellate Court.
Certain of the facts are undisputed. The victim lived in Cheshire with her husband and four children in a house owned by the victim’s mother. On the evening of May 3, 1990, the victim, who had been drinking, and her mother had an argument. The victim then took her [714]*714children and left the house, driving away in her car. Family members notified the police, who stopped the victim and arrested her for disorderly conduct and criminal mischief. The children were taken home and the victim, after being processed at the police station, was permitted to leave. Unable to contact her husband, the victim called a friend, who, shortly before midnight, dropped the victim off at a bar in Southington. Still unable to contact her husband, she ordered a drink at the bar, where she met the defendant and his girlfriend. The victim complained to the defendant about her arrest and explained that she was having difficulty finding a ride home. After the defendant had offered the victim a ride home, the victim, the defendant and his girlfriend left the bar together. Only then did the victim realize that the defendant and his girlfriend were driving separate cars. The defendant told his girlfriend that he would drive the victim home and then meet the girlfriend at their home in approximately ten minutes. The victim got into the defendant’s car. They were stopped almost immediately by the Cheshire police because the defendant’s car had a broken taillight. The police officer, who had known the victim for many years, observed her in the passenger seat and later testified that she appeared to be fine. The police officer gave the defendant a verbal warning and released the parties. Instead of taking the victim home, the defendant drove her to a secluded, wooded area.
With respect to subsequent events, the parties diverge in their versions of what occurred. The victim testified at trial that when they had arrived at the secluded area, the defendant had gone to the passenger side of the car and had asked her to get out. When the victim refused to leave the car, the defendant grabbed her and dragged her out by her hair. He then dragged her, on her back, across a gravel driveway to a leafy area, where he pinned her down, removed portions of [715]*715her clothing, and attempted to force her to engage in fellatio. The victim testified further that she had been able to distract the defendant and run back to the car. The defendant caught up with the victim in the car and forced her to have vaginal intercourse on the front passenger seat, during which he ejaculated. The defendant then took the victim home, where she called the police and reported having been sexually assaulted by the defendant.
The defendant testified that the victim had asked him to take her to a secluded area, where she had consented to sexual intercourse. He testified that the intercourse had taken place in a leafy and rocky area away from the car, and he denied having had intercourse inside the car. He stated that on the ride back to the victim’s house, she had pulled leaves and debris from her hair. State v. Cavell, 34 Conn. App. 276, 280, 641 A.2d 426 (1994).
The defendant appealed from the judgment of the trial court to the Appellate Court, which affirmed the judgment. Id., 276. We granted the defendant’s petition for certification, and remanded the case for reconsideration in light of our decision in State v. Robinson, 230 Conn. 591, 646 A.2d 118 (1994) (prejudice caused by trial court’s failure to enforce sequestration order merited new trial). State v. Cavell, 231 Conn. 902, 645 A.2d 1021 (1994). Upon reconsideration, the Appellate Court affirmed its previous judgment. State v. Cavell, 36 Conn. App. 912, 649 A.2d 262 (1994). This second certified appeal followed.
I
We first address the defendant’s claim that the Appellate Court incorrectly concluded that the trial court’s exclusion of the testimony of one of the defendant’s medical expert witnesses, due to the violation of a [716]*716sequestration order,3 was harmless error. The defendant argues that the trial court’s improper exclusion of his expert witness’ testimony violated his constitutional right to present a defense and, even if the impropriety was not of constitutional magnitude, the Appellate Court used an inappropriate standard in applying the harmless error doctrine. We disagree.
The trial began on April 23, 1991. Prior to the taking of any evidence, the court asked both parties whether either of them intended to request a sequestration order. Both the state and the defendant represented that a sequestration order was not necessary.
The victim testified on the first day of the trial, stating that after the defendant had dragged her across the gravel driveway to the leafy area and had attempted to force her to engage in fellatio, she had escaped and had ran back to the car. She further testified that the defendant then had forced her to have intercourse on the front passenger seat of the car, during which, she believed, he had ejaculated.
As additional evidence in its case-in-chief, the state called as a witness Sultan Quarishi, the emergency room physician who had examined the victim. Quarishi testified that the victim’s injuries were consistent with her having been dragged across the ground, but conceded on cross-examination that it was impossible to determine definitively what had caused the injuries.
[717]*717The state also called as a witness Marybeth Guman, a criminalist at the state police forensic laboratory. Guman testified that hair had been found in the defendant’s car and on clothing belonging to both the victim and the defendant. She testified that the hair was consistent with that of the victim, that it was remarkable in amount, and that she had never encountered a crime scene with so much hair linked to one person.
When the defendant commenced the presentation of his case, he objected to the fact that one of the detectives who had testified on behalf of the state was seated at counsel table with the assistant state’s attorney, assisting with the trial. The defendant, claiming that the detective’s presence at counsel table was prejudicial, moved that the detective be required to leave. After the court denied the motion, the defendant moved, pursuant to Practice Book § 876; see footnote 3; that the detective be sequestered. Subsequently, the state moved for a mutual sequestration order, which the court issued.4
The defendant called as a witness Michael Conroy, a surgeon, to testify about the cause of the victim’s injuries, particularly scratches and abrasions on her back. After Conroy had given preliminary testimony about his background, the state requested an offer of proof regarding the evidence Conroy would be offering and his credentials to offer that evidence. During the [718]*718offer of proof, Conroy revealed that he had been provided with, and had reviewed the preceding evening, a transcription of a portion of Quarishi’s testimony. The trial court determined that the defendant had violated the sequestration order by providing Conroy with a copy of Quarishi’s testimony. As a sanction for this violation, the court precluded Conroy from testifying further, and struck the testimony that he had already given.5 The court allowed the defendant nine days to obtain the services of another witness to testify in lieu of Conroy. The defendant retained another surgeon, Jack Huse, who subsequently testified as an expert witness regarding the victim’s injuries.
During the offer of proof regarding Conroy’s proposed testimony, Conroy, a graduate of Yale College and Cornell Medical School, had acknowledged that there are forensic criminalists who are trained in the reconstruction of crimes, but that he had received no such training. He stated that his knowledge regarding the etiology of wounds had come “from experience” rather than from specific training. He also stated that the only time he had visited the secluded area where the assault had taken place, in order to observe the conditions there, was on the preceding day, more than one year after the assault. Conroy proposed to testify that the victim’s injuries were consistent with her hav[719]*719ing engaged in active sex in the leafy area but were inconsistent with her having been dragged head first over the gravel driveway.
Huse, avascular surgeon, was a graduate of Dennison University and Hahneman University Medical School. He, too, lacked training in crime reconstruction. He testified that he had never received any training in the area of forensic science, had never taken any courses in crime scene reconstruction, and had no qualifications or credentials as a criminalist. Like Conroy, Huse had not visited the crime scene until shortly before he was to testify. Huse testified that the victim’s injuries could have resulted from consensual sexual intercourse in the leafy, rocky area at the site of the assault. He also testified that it would be very difficult to drag someone by the hair from behind, and that “[t]he first response of someone who has [her] hair pulled and the attempt to be dragged from behind is that [she] will turn around and right [herself] so [she] will be pulled forward rather than backwards.” Huse further testified that if the victim’s shirt were on and she were being pulled backward, as she claimed, the shirt would have protected her back and that the angle of pulling would have kept her back off the ground, thus avoiding injuries to her back. In addition, Huse testified that had the victim and the defendant had consensual intercourse in the leafy area, and had the victim, on the ride home, attempted to remove the leaves and other debris, a substantial amount of hair follicles would have come out and would have been present in the car.
A
The defendant argues that precluding Conroy from testifying was incorrect and of constitutional proportion because it prevented the defendant from presenting an effective defense. Maintaining that “[m]edical experts are not fungible”; State v. Cavell, supra, 34 [720]*720Conn. App. 299 (O’Connell, J., dissenting); and that “[o]ne expert may have more ‘presence’ and greater credibility, and thus be viewed by the trier of fact as more persuasive,” the defendant urges that this court “should not assume that the second choice — a choice ‘forced’ upon the defense — was as good as its first choice.” We are not persuaded.
We note, first, that for purposes of this analysis, we will assume that the trial court’s exclusion of Conroy’s testimony was an excessive sanction, and was, therefore, an abuse of discretion. We make this assumption, however, not because we have determined it to be so, but because that was the Appellate Court’s stance in deciding this case, and that was how we certified the relevant question. We therefore review the case in that procedural posture.
Ordinarily, the remedy for violation of a sequestration order lies in the trial court’s discretion. State v. Falby, 187 Conn. 6, 27, 444 A.2d 213 (1982). We acknowledge, however, that, under particular circumstances, the unjustified exclusion of a witness’ testimony can amount to a deprivation of the defendant’s right to present a defense. See, e.g., Braswell v. Wainwright, 463 F.2d 1148, 1155-56 (5th Cir. 1972) (holding that trial court’s discretionary exclusion of sole corroborating witness’ testimony denied defendant fundamental constitutional right). If an impropriety is of constitutional proportions, the state bears the burden of proving that the error was harmless beyond a reasonable doubt. State v. Colton, 227 Conn. 231, 253-54, 630 A.2d 577 (1993).
We acknowledge that experts are not fungible. In this case, however, both Conroy and Huse were surgeons, neither of whom specialized in the area of crime reconstruction.6 Yet, despite their lack of experience in the [721]*721field of crime reconstruction, both Conroy and Huse were asked to testify regarding how this incident could have happened, given the victim’s injuries and the conditions present at the site of the assault. Although, as the defendant suggests, Conroy attended what some might regard as more prestigious schools than those Huse had attended, the subject of the testimony that both Conroy and Huse were asked to provide was not within the core of those witnesses’ expertise, and we are not convinced that, for such a purpose, Conroy had credentials that were superior to those of Huse. We are similarly unpersuaded that there was anything in the proposed testimony of Conroy that was substantively different than what was actually presented by Huse. In fact, Huse’s testimony that a person would not be dragged in the manner described by the victim is more supportive of the defendant’s rendition of the facts than Conroy’s proposed testimony. Precluding Conroy from testifying, therefore, did not prevent the defendant from presenting an effective defense and did not violate his constitutional rights.
B
Because we conclude that any impropriety in this case is nonconstitutional, the defendant bears the burden of demonstrating that the trial court’s error caused him harm. State v. Dennison, 220 Conn. 652, 661, 600 A.2d 1343 (1991); Swenson v. Sawoska, 215 Conn. 148, 153, 575 A.2d 206 (1990). The defendant maintains that the Appellate Court employed an improper standard in concluding that the exclusion of Conroy as an expert witness was harmless. We disagree.
The standard for determining whether a nonconstitutional error is harmless is that “[t]he defendant must show that it is more probable than not that the errone[722]*722ous action of the court affected the result.” (Internal quotation marks omitted.) State v. Chapman, 229 Conn. 529, 544, 643 A.2d 1213 (1994); State v. Payne, 219 Conn. 93, 106, 511 A.2d 1246 (1991); State v. Belle, 215 Conn. 257, 269, 576 A.2d 139 (1990); State v. Johnson, 214 Conn. 161, 175, 571 A.2d 79 (1990). Although we have articulated the same principle in somewhat less definite terms; see, e.g., State v. Dennison, supra, 220 Conn. 661 (whether erroneous ruling “was harmful to [the defendant] in that it probably affected the outcome of the trial”); Swenson v. Sawoska, supra, 215 Conn. 153 (“whether the erroneous ruling ‘would likely affect the result’ ”); those alternate linguistic formulations did not change the fundamental nature of the appellate inquiry.
It is true, as the defendant points out, that the Appellate Court stated as its harmless error standard that “[t]he defendant has not shown that the result would have been different had the trial court permitted Conroy to testify.” (Emphasis added.) State v. Cavell, supra, 34 Conn. App. 294. We agree that the Appellate Court could have worded the harmless error standard more precisely by using the “more probable than not” language. We conclude, however, that the essence of the Appellate Court’s opinion accords with the proper harmless error test.
The Appellate Court sought to determine whether the substitution of Huse for Conroy was likely to have affected the outcome of the trial. Thus, although the exact language of the proper harmless error test may have been lacking, the manner of performing the test was present. The Appellate Court determined that “the testimony of Huse was equivalent to that intended by Conroy.” Id. As we have indicated, Huse and Conroy offered similar credentials and similar opinions, with Huse providing even more convincing testimony on the defendant’s behalf than Conroy, based on his offer, would have provided. Accordingly, we conclude that [723]*723the Appellate Court employed the proper analysis and properly concluded that the trial court’s preclusion of Conroy from testifying was harmless error.
II
We next address the defendant’s claim that the Appellate Court improperly concluded that: (1) the trial court correctly permitted the state to present forensic evidence in rebuttal; and (2) even if allowing the introduction of the rebuttal evidence was proper, the trial court properly prevented the defense from presenting surrebuttal evidence. We agree with the Appellate Court’s conclusions.
The following facts and procedural background are relevant to these claims of the defendant. Following the defendant’s arrest, his car was impounded and the passenger seat cushion was sent to the state police forensic laboratory for testing. Guman, the criminalist who testified in the state’s case-in-chief, stated that she had received, at the state laboratory, a piece of seat cushion to analyze. Initially she had tested the cushion only for trace materials. She had noticed that there was a stain on the seat cushion, but she did not examine the stain at that time.
The defendant testified as part of the defense case. On May 22, 1991, on cross-examination, the defendant denied ever having had intercourse with the victim in the car. The following day, the state resubmitted the seat cushion to the state police forensic laboratory in order to have the stain tested. The state received the laboratory report after court had recessed on the afternoon of May 28,1991, the day before the defendant was to rest his case. The report indicated the presence of semen on the seat cushion, with spermatozoa matching the defendant’s blood type. The following morning, the state immediately provided defense counsel with a copy of the forensic report. The defendant called his final [724]*724witness, Huse, and then, without requesting additional time to consider the newly received report, rested his case.
The state then offered, as rebuttal evidence, the laboratory report and the testimony of Granan, who had analyzed the stain on the seat cushion. The defendant objected, claiming that: (1) the state should have presented this evidence in its case-in-chief; and (2) allowing rebuttal evidence regarding a report that the defendant had just received constituted unfair surprise and prejudice. The state explained that the seat cushion was not initially tested for semen because “the defense of the defendant was consent and I didn’t feel that it was necessary to subject an item of evidence [to tests] that would have only established sexual intercourse when the defense [was] consent. Of course after the defendant took the stand and then claimed that he never had vaginal intercourse o[r] any kind of ejaculation in the front seat of the car, it bec[ame] an important issue and I immediately sent it down to the forensic lab [to be tested for semen].”
The court asked the defendant how his case would have changed if the seat cushion had been tested the previous year and he had received the information that the stain had tested positive for semen. The defendant responded that: (1) it would have provided him with the opportunity to hire his own criminalist; and (2) it would have given him the opportunity to present other explanations for the presence of semen in the car. The trial court ruled that the rebuttal evidence was admissible.7
[725]*725The defendant then requested the opportunity to offer surrebuttal evidence, on the basis that he had received the forensic report so late in the trial. The trial court refused to rule at that time, stating that it preferred to defer its ruling until after cross-examination of the witness offering the rebuttal evidence, and that it would then consider any offer of proof that the defendant presented regarding surrebuttal evidence.
During the state’s rebuttal, Guman testified that the stained seat cushion had tested positive for semen containing spermatozoa that were consistent with the defendant’s blood type. On cross-examination, Guman also testified that 36 percent of the population had the defendant’s blood type, and that she could not determine how long the stain had been present or whether other sexual activity had occurred in the car. Guman also testified that she did not know whether there had been prior owners of the car.
The defendant then renewed his request for surrebuttal. The only purpose he offered for surrebuttal was to have an independent laboratory analysis performed on the seat cushion.8 The defendant acknowledged, how[726]*726ever, that he had not made any arrangements for such an analysis. Notably, the defendant did not then indicate, as he had in his initial request for surrebuttal, that he might be able to present alternative explanations for the presence of the semen on the car seat. Concluding that it would be disruptive to the trial, the court denied the defendant’s request for surrebuttal.9
[727]*727A
The defendant claims that the Appellate Court improperly concluded that the trial court had not abused its discretion when it had admitted the state’s rebuttal evidence. We disagree.
“[R]ebuttal evidence is that which refutes the evidence presented by the defense . . . .” (Internal quotation marks omitted.) State v. Williamson, 206 Conn. 685, 698, 539 A.2d 561 (1988). When a defendant offers evidence in his defense, it is appropriate for the state to offer evidence to refute it, if possible. Id. The admission of rebuttal evidence is within the sound discretion of the court. State v. Cavell, supra, 34 Conn. App. 282, citing State v. Canty, 223 Conn. 703, 715-16, 613 A.2d 1287 (1992).
The fact that the state might have opted to have the seat cushion tested for traces of semen earlier in the proceedings and could have offered the test results as part of its case-in-chief does not preclude the state from offering that same evidence instead to rebut the defendant’s testimony.10 State v. Lisella, 187 Conn. 335, [728]*728336, 445 A.2d 922 (1982). The defendant had known for at least four weeks, from the time that the victim had testified, that the location of the intercourse, not simply the victim’s consent, was an issue in the case. The state, in contrast, was not aware until the defendant testified, on May 22, 1991, that he had never engaged in intercourse with the victim in the car, that establishing the presence of semen in the car was necessary to lend credibility to the victim’s version of the facts and to discredit the defendant’s version. Until that point, it was not unreasonable for the state, believing consent was the only issue, to determine that testing of the stain was unnecessary. After the state had heard the defendant’s testimony, it took immediate steps to examine the seat cushion for the presence of semen.
Under the circumstances, it was within the trial court’s discretion to admit the forensic report and Guman’s testimony as rebuttal evidence.
The defendant next claims that, even if the admission of the rebuttal evidence was proper, the Appellate Court [729]*729improperly concluded that the trial court had acted within its discretion in denying the defendant the opportunity for surrebuttal. We disagree.
We have previously stated that “there is no constitutional right to present surrebuttal evidence. . . . The presentation of surrebuttal evidence is a matter resting squarely within the discretion of the trial court. . . . The defendant must demonstrate some compelling circumstance and the proffered evidence must be of such importance that its omission puts in doubt the achievement of a just result.”11 (Citations omitted; internal quotation marks omitted.) State v. Williams, 231 Conn. 235, 253-54, 645 A.2d 999 (1994).
[730]*730Unlike the state, which did not know until the time of the defendant’s testimony that the location of intercourse was an important element in the case, the defendant had known for a minimum of four weeks, at least since the time of the victim’s testimony, that the parties disagreed as to the location of the intercourse. The defendant, however, took no steps to have the stained car seat tested. Also, the defendant was in possession of the forensic report before he rested his case, but made no request at that time for a continuance in order to prepare a response.
Even after the presentation of rebuttal evidence, the defendant made no arrangements with a laboratory to have the stain tested, and made no offer of proof as to other evidence that might explain the results of the forensic test. We conclude, under these circumstances, that the defendant has neither demonstrated the requisite compelling circumstances nor proffered evidence of such importance that surrebuttal was required.12 We [731]*731agree, therefore, with the Appellate Court that the trial court acted within its discretion when it denied the defendant the opportunity to present surrebuttal evidence.
The judgment of the Appellate Court is affirmed.
In this opinion PETERS, C. J., and CALLAHAN, J., concurred.