This letter reports a scanning electron microscopy investigation of surface acoustic wave diffraction on the zigzag domain wall in a Gd2(MoO4)3crystal. The zigzag domain wall with ∼80 &mgr;m period was formed in a Gd2(MoO4)3crystal by applying the external mechanical stress. It is shown that the surface acoustic wave diffracts on the zigzag domain wall in a ferroelastic Gd2(MoO4)3crystal. ©1996 American Institute of Physics.