This will depend on what version of the product you are using. The latest version of the product does have this support and it can be seen in action over at the following link where I do this exact thing with a GaAs reflectance simulation (<a href=”https://www.gotostage.com/channel/d900ec5d9e904423aa1e873d8dc5df83/recording/9d2816e75e7c474a8fb8756040f92b52/watch?source=CHANNEL”>https://www.gotostage.com/channel/d900ec5d9e904423aa1e873d8dc5df83/recording/9d2816e75e7c474a8fb8756040f92b52/watch?source=CHANNEL</a>).
Scott