. "In one of its aspects, the invention is a method for depositing on a substrate a metal oxide coating which reflects light diffusely, which comprises subjecting said substrate to alternating feed pulses of a hydrolyzable chloride of said metal and of water at pressures in the range of about 180-1250 and about 150-650 millitorr respectively, with evacuation of the deposition system to a pressure in" . . . .