Please, see chap. 5 and 6 in the book "EM waves and antennas" S. Orfanidis.
There are a bunch of methods described in this free lecture series on computational electromagnetics.
http://emlab.utep.edu/ee5390cem.htm
I think you should look first at the transfer matrix method. You can also use a simple impedance transformation from microwave network theory.
Also, are you asking about just a single interface? If so, you are looking for what is called the Fresnel equations. They calculate the reflection and transmission coefficients for angle angle of incidence. If your problem contains multiple interfaces, then see prior comments. If your surface is rough, very often the roughness is treated as a separate layer with some effective material properties.
Hola
La UIT tiene dos recomendaciones que se entrelazan en ese calculo. Yo lo he usado para la teoria basica de propagacion en sistemas celulares y en modelos de propagacion de linea de vista, estas son : R-REC-P.526-11-200910 y R.REC-P.527-3-199203.
Espero te ayuden
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