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Polarisation angel psi is given by the E-vector of the incident beam
in the incident plane. This angle equals 0 for TM-incidence and pi/2
for TE-polarisation.
If asking for R_TM(x,y), the Ep component will be returned whereas R_TE(x,y) will return the Es component. R(x,y) is the real reflection i.e. sqrt(R_TM^2 + R_TE^2). And the same is the case for transmission, T(x,y).