Szukana fraza: [Abstract = "The four plane waves that are propagating across the medium are, shown namely\: longitudinal displacement, P\-wave, thermal diffusion T\-wave, mass diffusion MD\-wave and shear vertical SV\-wave. These four plane wave velocities are listed for a specific medium, illustrating the impact of the diffusion coefficient and are graphically represented. Expressions for the reflection coefficient for the incidence plane wave are produced from research on the reflection of plane waves from the stress\-free surface."]

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