Interaction between a surface acoustic wave and adsorbed atoms
  Within nonlocal elastic interaction between an adsorbed atom and matrix atoms and in consideration of the mirror image forces, a dispersion law of elastic surface acoustic waves is found to the long-wavelength approximation depending on the concentration of adsorbed atoms and the deformation potential of the adatom. The energy width of the surface acoustic mode is calculated depending on the concentration of adsorbed atoms. 
R.M. Peleshchak, M.Ya. Seneta
cond-mat.mes-hall