An Increase of Threading Dislocations Filtering Efficiency in Al2O3 Templates with Faceted Surface Morphology During a Growth by Molecular Beam Epitaxy. - Myasoedov, A. V.; Nechaev, D. V.; Ratnikov, V. V.; Kalmykov, A. E.; Sorokin, L. M.; Jmerik, V. N. (Technical Physics Letters, 2020)