Hi, The reflection coefficient (R) of an EM wave is, as far as I know, 1 if there is total reflection and -1 if there is total reflection AND the phase changes by 180º. However, we also know that the transmission coefficient is given by T = R + 1 (or by its own formula, which should give the same result) That seems to mean that if the R is one (total reflection), T would be two. How can that be possible? I have a situation in which I did the calculations and that's the result I got, but it doesn't make sense to me. Shouldn't T be always 0 when there is total reflection, or did I misunderstand its meaning?