The special self-suporting monocrystalline Au films with 500Å thickness were prepared by evaporating gold onto some monocryatslline Ag films in vaccum

and then separating the Au films by dissolving silver in diluted nitric acid. The optical transmittance of a light beam of films helped monitor the thickness and the rate of deposition during evaporation. The surface of films were examined by a scanning electron microscope (SEM). The monocry-stallinity of the films was excellent as measured by both X ray and electron diffraction methods. The normalized yield of the aligned spectrum measured by back-scattering method is 30% of that of the random direction.