Number 32 (Story #4), May 1, 1991 by Phillip F. Schewe and Ben Stein SINGLE-CRYSTAL DIAMOND FILMS have been prepared by Jagdish Naraya of North Carolina State University. First implanting carbon atoms in a copper substrate, he then blasts his sample with laser light, which melts the surface layer. Carbon atoms reassemble on top as a single diamond thin film. If the single-crystal films can be scaled up in size from the present 100 square microns in area, then Naraya's process may be preferable for use in future diamond-based electronics rather than the chemical vapor deposition (CVD) technique which results in a polycrystalline sheet of diamond. (Science, 19 April 1991.)