抄録
It has been confirmed by many electron diffraction works that the singlecrystal-like films of silver, gold, copper, and nickel which are formed on heated cleavage surfaces of rocksalt by evaporation in vacuo have the repeated twinning structures. However, the thickness, the area, and the repeat frequency of the twinned layer have not yet been studied. The present work was undertaken to study these points by means of electron microscope. Parallel, linear stripes are observed in electron micrographs of the films. These stripes are attributed to the twinned lattice, the thickness of which is of the order of one hundred Å. Parallel, linear stripes are not observed for aluminium. This agrees with the fact that no twinning occurs in this metal.
