  We obtain the Plancherel decomposition for a reductive symmetric space in the
sense of representation theory. Our starting point is the Plancherel formula
for spherical Schwartz functions, obtained in part I (math.RT/0107063). The
formula for Schwartz functions involves Eisenstein integrals obtained by a
residual calculus. In the present paper we identify these integrals as matrix
coefficients of the generalized principal series.
