The c(4 X 2) reconstruction of Ge(001) has been studied by x-ray diffraction of 150 K by measuring in-plane rejections and out-of-plane intensities of fractional order rods. The structure consists of an alternate arrangement of buckled dimers (tilt angle 19~1 ) along the [110] and [110] surface directions. The dimer rows are not straight along the [110] direction but show a slight zigzag with an amplitude of 0.340~0.005 A.

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