An article including a substrate, a layer of an inert oxide material upon the surface of the substrate, (generally the inert oxide material layer has a smooth surface, i.e., a RMS roughness of less than about 2 nm), a layer of an amorphous oxide or oxynitride material upon the inert oxide material layer, a layer of an oriented cubic oxide material having a rock-salt-like structure upon the amorphous oxide material layer is provided together with additional layers such as at least one layer of a buffer material upon the oriented cubic oxide material layer or a HTS top-layer of YBCO directly upon the oriented cubic oxide material layer. With a HTS top-layer of YBCO upon at least one layer of a buffer material in such an article, J.sub.c's of 1.4.times.10.sup.6 A/cm.sup.2 have been demonstrated with projected I.sub.c's of 210 Amperes across a sample 1 cm wide.
 The present invention relates to high temperature superconducting thick films on polycrystalline substrates with high J.sub.c's and I.sub.c's and to structural template articles for subsequent deposition of an oriented film, e.g., of superconducting thick films. This invention is the result of a contract with the United States Department of Energy (Contract No. W-7405-ENG-36). The government has certain rights to this invention.