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First the existence of anomalous resisto-acoustic effect for weakly inhomogeneous surface acoustic waves in structure “piezoelectric crystal—thin conducting film” was experimentally confirmed. At that the experimental value of the positive change in velocity turned out to be significantly less than the theoretically expected value for the ideal state of the crystal surface. The investigation showed that this effect is extremely sensitive to real state of the waveguide surface, which is caused by mechanical and chemical processing of sample, and also by technology of film deposition and removing. Taking into account the real state of the surface led to good agreement of theoretical results with experimental data.