Abstract
Tarnish layers of AgCl were grown by reaction of HCl + Cl2 gas with silver at 20 °C. Eight different systems of epitaxy were observed in the characteristic crystallographic triangle of Ag by diffraction of 60 kV electrons. The area around the Ag(011)pole is covered with monocrystalline AgCl having a continuous tilt depending of the angular distance from Ag(011). All systems of epitaxy are characterized by a small misfit of distance between low indexed atomic chains in Ag and AgCl.