140976.fig.0033a
(a)
140976.fig.0033b
(b)
Figure 33: Atomic Force Microscopy (AFM) image of a typical STO(100) substrate surface after etching and heat treatment, with unit cell steps of 3.9 Å height. Below are the corresponding RHEED surface images taken in [ 0 1 1 ] and [ 0 0 1 ] directions.