Equation Icon  ps(1-+-σ) { 2 − ksz 2 ksz As (z) = πa ζ YΔ − [(1 − 2σ)Qs + 2qsxs]e + [(1 − 2σ )Rs − 2qsxs]e s[ s −k z k z]} +ksz Qse s + Rse s (8.133 )