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Characteristics of bulk waves generated by an incident Rayleigh wave at a groove discontinuity are studied in this paper. The groove, etched on top of a semi-infinite elastic substrate, is an elementary building block of a reflector-array type of signal processing devices. The mode-conversion problem is treated by a boundary perturbation technique. Two types of bulk wave are excited, i.e., p and sv waves. Their propagation and power characteristics are investigated.