What is the phase shift (0, π/2, π, or 3π/2) for the following phases compared to P: PP, PPP, PPPP, pP, pPP, PcP (near normal incidence), PcP (near intersection with P)? What is the phase shift for...

What is the phase shift (0, π/2, π, or 3π/2) for the following phases compared to

P: PP, PPP, PPPP, pP, pPP, PcP (near normal incidence), PcP (near intersection

with P)? What is the phase shift for the following SH phases compared to S: SS,

SSS, SSSS, sS, sSS, ScS (near normal incidence), ScS (near intersection with S)?