  We calculate the degree to which the final structure of the local groundstate
in a liquid is a function of the strength of a perturbing potential applied
during energy minimization. This structural susceptibility is shown to
correlate well with the observed tendency of liquid adjacent to a crystal
interface to exhibit a crystalline groundstate, a feature that has been
strongly linked to the observation of ultra-fast crystal growth in pure metals
and ionic melts. It is shown that the structural susceptibility increases
dramatically as the interaction potential between atoms is softened.
