Scanning tunneling microscopy studies on the growth of Au on Fe(001) are reported. A surface alloy is observed for submonolayer deposition ( <0.5 monolayer) at temperatures higher than 370 K. This surface-confined alloy demixes when it is covered with Au and in combination with imperfect layer-by-layer growth a rough interface consisting of Au islands in and Fe islands on the original Fe(001) substrate is created. A real-space high resolution study of this buried interface is possible because of the large difference in interlayer spacing between bcc Fe(001) and fcc Au(001).

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The growth of ultrathin films of Cr on Cu͑001͒ over the temperature range 285-575 K is reported. Film formation has been studied by scanning tunneling microscopy, Auger electron spectroscopy, and low-energy electron diffraction. The growth is found to be three dimensional in character with the formation of irregular multilayer high islands. The deposited chromium becomes more particulate and bulklike in nature with increasing deposition temperature, with the formation of high surface outgrowths. The films are metastable and agglomerate upon annealing at higher temperatures.

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