I have a non-sequential object that I would like to exhibit different reflexion/transmission based on which side on the surface the incoming power is.

Picture a plane plate where a given R/T values correspond to air-to-plate interface, but with different R/T values for the same face for the plate-to-air direction.

In other words, I’d like a coating where going from air (1) to object (2) R12 and T12, and R21 et T21 with R21!=T12 and R12!=T21.

Does that make sense ? is it possible in zemax ? if so, how to do it in non-sequential ?