“…And then Afferrante and Ciavarella [13] show that in the case of small material mismatch generalized Rayleigh waves exists already under frictionless conditions and the critical f for instability is zero. Wang et al [14] investigated the slip waves propagating along an interface between two anisotropic solids in the frictional sliding contact with local stick-slip. Liu et al [15] studied the effect of an FGM coating on dynamic instabilities in the sliding of two elastic half-planes.…”