Abstract: This paper investigates the dispersioncharacteristics of shear horizontal (SH) waves propagating in apiezoelectric/piezomagnetic layered half-space with a weak interface. Theso-called ``spring'' model is used to describe the interfacial property. Thesurface of the piezoelectric layer is electrically closed or open. Thecloses-form dispersion equation is derived, and the numerical examples areprovided to show the influences of the interfacial property and theelectrical boundary conditions on the dispersive characteristics of SHwaves. The results show that: (1) weak bonding lowers the propagationvelocity, and it makes the dispersion curve of the first mode for theelectrically closed condition have a minimum less than the velocity of theB-G surface wave; (2) when the surface of the piezoelectric layer iselectrically open, the phase velocities of the first mode are always morethan the bulk shear wave speed of the piezoelectric medium.