Perovskite oxides with the formula ABO3 have two possible terminating atomic
layers--AO (A-site layer) and BO2 (B-site layer) on the { 001 } surfaces.
Surface preparation techniques to obtain a purely single termination layer on the surface
have been developed for many of the perovskite substrates listed in Table 5.1.
These techniques typically include a combination of annealing and wet etching
steps.