Availability of a thin liquid layer on the surface of the piezoelectric acoustic duct leads to perturbation conditions of propagation of surface acoustic waves (SAW). Analytical expressions for describing of the attenuation and the relative change in the SAW velocity as a function of the normalized thickness of the liquid layer were obtained. It is shown that dielectric and acoustic components of perturbation of SAW propagation conditions caused by the liquid layer can be considered independently.
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