Theoretical expressions for the electron-phonon contribution to the attenuation of surface acoustic waves (SAW) propagating on a semi-infinite block of material have been obtained for all ql, where q is the sound propagation vector and l is the electron mean-free path. The calculation of the attenuation due to electron-phonon interaction for ql1 is straightforward; however, extension of this calculation to all ql values requires knowledge of the ql dependence of the viscous damping coefficients, chi and eta . Approximations for chi and eta for all ql are obtained by analogy with attenuation expressions derived for longitudinal transverse bulk sound waves. Curves for chi , eta , and the electron-phonon contribution to the attenuation of SAW propagating on a semi-infinite block of aluminum are presented.
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