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The surface structure of SrTiOaGOO) was analyzed at r -120 K by means of low-energy-electron diffraction. The best theory-experiment fit results for a surface containing domains of two different layer terminations. Both of them show a first-layer puckering, with oxygen ions being pulled out of the surface by .s(Ti) =0.08 A and s(Sr) =0.16 A, combined with a relaxation of the first two layer distances. This proves the surface to be ferroelectric, different from the bulk property in agreement with theoretical predictions.

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