  Relaxation of the additivity condition on the interaction length between
unlike species in a binary mixture of soft disks opens up a rich variety of
structures in both crystal and amorphous states with an associated diverse
range of relaxation dynamics. We report on MD simulation studies of binary soft
disks with negative deviations from additivity that include evidence of
accumulation of crystal-like structures in metastable liquids prior to
crystallization and the occurrence of a liquid to random-tiling transition.
