“…> arcsin ( n2/ nl) and 0, > arcsin (n3/ nl), we have: (3), (6), (9) and (12) Now we shall analyse formulae (3) to (14). As it follows from (9) and (12), when arcsin ( n 2 / n l ) > > arcsin (n3/n1), the sine-shaped standing wave arises in the film under study.…”