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Scanning tunneling microscopy and first-principles atomic orbital based calculations have been used to study TiO 2 (110)1ϫ2. A structure is proposed that resolves the controversy surrounding the surface morphology. Our model is simple, in that it consists only of atoms in their bulk-terminated positions. Theoretical modeling of the images shows an agreement with the experimental data that cannot be achieved even qualitatively for the previously proposed models. Furthermore, a previously unobserved 1ϫ3 phase has been imaged that can be simply explained in terms of the model.

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