Waves of general type propagating in a liquid layer sandwiched between two thermo-elastic half-spaces

Waves of general type propagating in a compressible non-viscous liquid bounded on both sides by two different generalised thermoelastic half-spaces are studied. It is found that, unlike in the case of classical (Stoneley-type) waves, the motion is not necessarily two dimensional, and that the particles of the solids and the liquid vibrate in three different planes, in general. The orientation of each of these planes varies from point to point, in general, and only under a particular condition do these planes coincide and become perpendicular to the interfaces. Further, a single scalar function determines all the physical quantities associated with the waves, and the phase velocity equation holds irrespective of the form of wave front.