  Predictions of J/Psi formation at RHIC via "off-diagonal" combinations of
charm and anticharm quarks in a region of color deconfinement are confronted
with initial data from the PHENIX collaboration. We find that the measured
centrality behavior places significant constraints on the various parameters
which control model calculations of J/Psi formation. Within present statistical
and systematic uncertainties, one can map out a region of parameter space
within which the contribution of formation in a deconfined phase is allowed. As
these uncertainties decrease and new data from d-Au interactions becomes
available, it is expected that definitive tests for the presence of this
formation mechanism will be possible. We anticipate that the rapidity and
transverse momentum spectra will prove decisive for a final determination.
