In the first calculations we have calculated the interaction energies of the TiCl4 molecule on the selected surfaces. These energies are -0.29 eV for the anatase TiO2, -0.22 eV for the rutile TiO2 and 0.87 eV for the Al2O3. These energies indicate that TiCl4 will adsorb favourably, although with a small energy gain, on the anatase TiO2 surface and rutile TiO2 surface and will not adsorb on the Al2O3 surface. These results show that the choice of the surface can have a major impact on the initial deposition steps. As we find that the adsorption of TiCl4 is not favourable on the Al2O3 surface, we continue with only the anatase TiO2 surface models and rutile TiO2 surface models.