“…In Nagendra et al (2002), the radiation field is represented by the two Stokes parameters I and Q and there is no azimuthal Fourier decomposition of the angle-dependent PRD functions. For the thin slab, the model parameters are (T, a, , r, Γ E /Γ R ) = (10, 10 −3 , 10 −4 , 0, 1) and for the thick slab they are (T, a, , r, Γ E /Γ R ) = (10 3 , 10 −3 , 10 −4 , 0, 0).…”