Field and Wave Electromagnetics 2nd Edition by David Cheng

Exercise 86

For the case of oblique incidence of a uniform plane wave with parallel polarization on a perfectly conducting plane boundary as shown in Fig. 8-13, write
(a) the instantaneous expressions
E 1 (x, z; t) and H 1 (x, z; t)
for the total field in medium 1, using a sine reference, and
(b) the time-average Poynting vector.