We show that the angular distributions of leptons or jets due to t (t) over
bar spin correlations allow a determination of the top quark chromomagneti
c moment kappa with an accuracy of order 0.1. The method is quite insensiti
ve to background, event reconstruction, and other experimental uncertaintie
s. The total event number is important, so we suggest the inclusion of all-
hadronic events. [S0556-2821(99)01621-5].