  Using a multiphase transport (AMPT) model that includes both initial partonic
and final hadronic interactions, we study the pion interferometry at the
Relativistic Heavy Ion Collider. We find that the two-pion correlation function
is sensitive to the magnitude of the parton scattering cross section, which
controls the parton density at which the transition from the partonic to
hadronic matter occurs. Also, the emission source of pions is non-Gaussian,
leading to source radii that can be more than twice larger than the radius
parameters extracted from a Gaussian fit to the correlation function.
