ADDED ROW MODEL OF TIO2(110)1X2

Scanning tunneling microscopy and first-principles atomic orbital base d calculations have been used to study TiO2(110)1x2. A structure is pr oposed that resolves the controversy surrounding the surface morpholog y. Our model is simple, in that it consists only of atoms in their bul k-terminated positions. Theoretical modeling of the images shows an ag reement with the experimental data that cannot be achieved even qualit atively for the previously proposed models. Furthermore, a previously unobserved 1x3 phase has been imaged that can be simply explained in t erms of the model. [S0163-1829(98)02327-3].