Anisotropic reflection coefficients for a weak‐contrast interface

In this article the interaction of plane waves with a weak‐contrast interface between two weakly anisotropic half‐spaces is investigated. The anisotropy dealt with is of a general type. The stress–displacement vectors of the plane waves are calculated by perturbation theory. By assuming that the jump in elastic parameters and density across the interface is small, one can derive a simple expression for the RqPqP coefficient. In cases in which the wave motion is restricted to a symmetry plane of an anisotropic medium, simple expressions for the RqSVqSV and RSHSH coefficients are also derived.