Atomic layer epitaxy (ALE) deposition of titanium dioxide thin films using titanium isopropoxide and water as precursors was studied. The deposition temperature was limited to below 350-degrees-C by the thermal decomposition of the alkoxide. Films were studied by means of spectrophotometry, XRD, RBS, NRA, SEM, and AFM. A comparison with the ALE process using titanium tetrachloride as a titanium precursor is being carried out.