Atomic structure of the As-rich InAs(100) beta 2(2 x 4) surface

The surface atomic structure of the molecular-beam epitaxy prepared As-rich InAs(100) (2 x 4) reconstruction has been solved by synchrotron radiation surface x-ray diffraction. Analysis of a large set of nonequivalent in-plan e diffraction peaks and seven out-of-plane rods yields the so-called beta 2 -(2 x 4) model, a now recognized model for the As-rich GaAs(100) (2 x 4) st ructure. The structure comprises two As dimers in the top layer and one As dimer in the third layer below the first incomplete In layer. [S0163-1829(9 9)01723-3].