We present a theory for the inelastic scattering cross-section in hexagonal
boron nitride. Explicitly accounting for effects of beam convergence and a
finite collection aperture, we present an approach that well describes the
form of the observed Boron K-edge. We use this technique to investigate th
e crystallographic structure of boron nitride nanometric hollow spheres. (C
) 1999 Elsevier Science B.V. All rights reserved.