“…It has long been known that the shape of field‐evaporated endforms is not hemispherical (Loberg & Norden, 1968; Drechsler & Wolf, 1958; Gomer, 1961; Wilkes et al , 1974; Larson et al , 1999). For the case of relatively simple samples (those not containing multiple phases/features with different evaporation fields), this can be attributed to (1) crystallographic faceting (dependence of evaporation field on work function and/or surface energy), (2) the varying field distribution with polar angle above the specimen surface due to the presence of a shank angle (the specimen is not a perfect sphere, but is in fact a needle shape) (Gipson & Eaton, 1980; Gomer, 1961; Gipson, 1980; Van Eekelen, 1970) and/or (3) the presence of a counter electrode (Kelly & Larson, 2000).…”