Considerations of the existence of interfacial (Stoneley) waves in bonded anisotropic elastic half-spaces

The questions of uniqueness and existence of subsonic Stoneley waves in bonded anisotropic linear elastic half-spaces are settled by using the notion of the interface impedance tensor, which is a simple linear combination of the hermitian surface impedance tensors of the separate half-spaces. A definite existence criterion is presented in a form that proves most useful in numerical searches for Stoneley waves, in the sense that such searches need not be conducted when a Stoneley wave mode does not exist.