Figure 37: (a) RHEED (0,0) spot intensity as function of time for a BTO/STO heterostructure grown at 𝑇 s u b 7 0 0 °C, p(O2) = 0.002 mbar and 𝐹 2 , 5  J/cm2 on STO(100). The oscillations are visible over the whole deposition time. The first STO layer is 16, and the following BTO layer is 21 monolayers thick. (b) AFM image after growth of two double layers of STO and BTO.