Epitaxial Tl2Ba2CaCu2O8superconducting films have been successfully grown on the dielectric Sr2(AlTa)O6(SAT) buffer layers. X‐ray diffraction data showed that the films were highlyc‐axis oriented with a rocking curve full width half maximum as narrow as 0.3°. The films also had an excellent in‐plane epitaxy with Tl2Ba2CaCu2O8[100] aligned with SAT[100] and MgO[100] of the substrate. The zero resistance temperatureTcof the superconducting films ranged from 95 to 103 K and the transport critical current densityJcin zero field was 3×105A/cm2at 77 K. ©1995 American Institute of Physics.