这是用于求解精确求解zoeppritz方程的程序，可用于AVO反演，合成地震记录等-This function computes the particle displacement reflection and

　transmission coefficients (the relative displacement amplitudes)

　for a solid-solid interface, a liquid-solid interface,

　a solid-liquid interface, and a liquid-liquid interface.

　The medium on each side of a given interface is perfectly elastic.

　The output is the value of the reflection or transmission

coefficient, specified by the user at the incidence angle anginc

(see input parameters).