Scanning tunnelling microscopy results were presented for an ordered Cr/Pt surface alloy, formed upon annealing 1.5 to 3ML Cr/Pt(111) to 800K. This alloy exhibited a nanoscale pattern with remarkable features (surface step edges), formed a highly symmetrical hexagonal network of one-atom-wide dislocation lines (unit-cell dimension: 17.3Å), and the contrast in scanning tunnelling microscopic images was sensitive to the scanning tunnelling microscopy bias voltage, reflecting a strong local variation in the electronic structure due to the presence of a regular array of two-dimensional Cr clusters containing 10 atoms.

Highly Ordered Nanoscale Surface Alloy Formed through Cr-Induced Pt(111) Reconstruction. L.Zhang, J.van Ek, U.Diebold: Physical Review B, 1998, 57, R4285-8