Epitaxially crystallized phosphatidylethanolamines produce (Fig. 1) (001) electron diffraction data similar in resolution to X-ray data from oriented multilamellae. An attemped crystal structure analysis with such data based on a rigid body translation of the molecular conformation found in the X-ray crystal structure of the racemic dilauroyl homolog yielded a structural solution unlike that found in our re-analysis of the low angle X-ray data. The X-ray analysis, like other phospholipid crystal structure determinations, indicate that the z-component of the polar head group packing must place phosphorus atoms 4 to 5Å apart in the absence of solvent. The Patterson functions computed from electron or X-ray data are also consistent with this thesis.