We report the first atomic resolution scanning tunneling microscopy images of the InP͑100͒-͑2 3 4͒ surface. High resolution images were obtained for both occupied and unoccupied states. The 34 periodicity is due to missing rows, and the 32 periodicity to the repetition of what appear to be trimer units. It is demonstrated that the images are inconsistent with dimer-based models proposed for related semiconductor surfaces such as GaAs. [S0031-9007(96)

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