Hello world,
I haven't been able to evaluate the predefined physics variable for the Fresnel reflection coefficient gop.matd1.rpf or gop.matd1.rpr in an Evaluation Group in the Results node of my model. To test out if it was something wrong with my model, I went back to the https://www.comsol.com/model/anti-reflective-coating-multilayer-19279 example and tried to do the same thing from its results and got the error shown in the image attached. This is the same error I got with my model. I've evaluated predefined physics variables in other models in the Wave Optics module, and this is my first time using the Ray Optics Geometrical Optics module, but I wouldn't expect it to be any different.
In my model I need to generate a surface plot of the imaginary part of the reflection coefficient against frequency and wavenumber.
Any advice on what I'm doing wrong would be really appreciated!