In Rutile displaystyle (TiO_{2}) structure, If the number of an effective number of molecules in each unit cell is x and coordination number of oxygen in each unit cell is y what
Rutile - Wikipedia
Rutile TiO2 Bulk Structural and Vibrational Properties: A DFT Study on the Importance of Pseudopotentials
Anatase and rutile TiO2 monodisperse microspheres by rapid thermal annealing: A method to avoid sintering at high temperatures - ScienceDirect