Abstract
The presence of an interface strongly affects the attenuation of surface-acoustic waves due to coupling to temperature fluctuations via the thermoelastic effect. This is demonstrated for Rayleigh waves propagating in a substrate coated by a thin film with thermal conductivity and heat capacity different from those of the substrate. Even if the thickness of the film is so small that its effects on the frequency and displacement field are negligible, the attenuation coefficient of the surface wave can be strongly enhanced.
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