Surface layer method for far filed diffractions of SV surface waves

We investigate SV polarized wave field in the elastic gradient layer of constant width. A point source is situated at the boundary of the layer. We assume the rigid contact conditions are valid at the boundary between the layer and elastic half-space. We show that the interference field in the main approximation far from the source does not depend on the relation between phase velocity and transversal and longitudinal velocities in the half-space. Bibl. 11 titles.