1. Recent reviews of the preparation and properties of YBCO films are given by: R.G. Humphreys, J.S. Satchell, N.G. Chew, J.A. Edwards, S.W. Goodyear, S. E. Blenkinsop, 0.D. Dosser, and A.G. Cullis, Supercond. Sci. Technol. 3, 38 (1990);
2. M. Leskela, J.K. Truman, C.H. Mueller, and P.H. Holloway, to be published in J. Vac. Sci. Technol., 1990.
3. S.Y. Lee, B. Murdock, D. Chin, and T. Van Duzer. No.165, edited by J. Harper, R. Colton, and L. Feldman ( American Institute of Physics, New York, 1988 ), p. 427.
4. M. Gurvitch and A.T. Fiory, MRS Symp. Proc. Vol. 99, edited by M.B. Brodsky, R.C. Dynes, K. Kitazawa, and H.L. Tuller ( MRS, Pittsburgh, 1988 ), p. 297.
5. A. Mogro-Campero and L.G. Turner, Appl. Phys. Lett. 52, 1185 (1988).