Abstract
Very thin layers (0–20 Å) of silver bromide and of copper have been deposited on to smooth (111) surfaces of silver single crystals. The thickness of these layers has been determined by means of a radioactive technique. The electron diffraction patterns from the layers have been studied as a function of their thickness. The layers do not grow as uniform films but as nucleated deposits. It is found that the thinnest detectable layer is 0·4 Å in mean thickness for the silver bromide and 0·8 Å for the copper.

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