Influence of Experimental Parameters on the Determination of Tetragonal Distortion in Heterostructures by LACBED Aldo Armigliato, Roberto Balboni, Franco Corticelli and Stefano Frabboni Microsc. Microanal. Microstruct., 6 5-6 (1995) 449-456 DOI: 10.1051/mmm:1995135