  Synchrotron and lab-scale x-ray diffraction shows that tetragonal-like
T'-BiFeO3 films on miscut LaAlO3 substrates (miscut < 5 deg) exhibit
(00l)-planes tilted away from those of the substrate as predicted by the "Nagai
model" (except for miscut <0.2 deg). Tilts as large as 1 deg are achieved even
in 100 nm thick films, strikingly larger than those observed in other
perovskites. We attribute this to the large c/a ratio and the high crystalline
coherency of the T'-BiFeO3/LaAlO3 interface. This coherency is possible through
an observed "diagonal-on-diagonal" alignment. Interestingly, the substrate
miscut does not influence the relative population of monoclinic domains.
