Bonding direction and surface‐structure orientation on GaAs (001)

An experimental study to determine the orientation of surface structures with respect to atomic‐bond direction is presented. The As‐stabilized (2×4) and C(2×8), and Ga‐stabilized (4×2) and C(8×2) surface structures all have their twofold direction parallel to the plane containing the dangling surface bonds and perpendicular to that of the back bonds.

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