We derive a simple analytic expression for q (q) over bar,gg --> t (t)
over bar --> bW(+)(b) over bar W- b (l) over bar nu(l) (b) over bar l
'<(nu)over bar>(l') for on shell intermediate states with the interfer
ence effects due to the polarizations of the t and (t) over bar. We th
en investigate how this effect may be measured at Tevatron or other ha
dronic colliders.