*Crystal Facet Engineering of TiO2 from Theory to Application DOI: http://dx.doi.org/10.5772/intechopen.111565*

(0 0 1) surface, reconstruction of the rutile (0 0 1), (0 1 1), and (1 0 0) surfaces, as well as two possible geometries of anatase (1 0 3), including smooth (1 0 3)s and faceted (1 0 3)f terminations. The following description is a summation of these works. Finally, a different number of atoms exposed to the environment are discussed for different surfaces. For example, atoms from the second (or deeper) atomic layer are not always considered as "exposed" by the authors, although they are needed to complete surface structure. Here, if the surface structure has visible steps that give possible access to such atoms, we have always considered them as exposed ones. Nevertheless, it should be minded that such atoms are more or less covered with the ones located closer to the top of the surface and might be less accessible in practice.
