  Whereas the first part of this paper dealt with the relaxation in the
beta-regime, this part investigates the final (alpha) relaxation of a simulated
polymer melt consisting of short non-entangled chains above the critical
temperature Tc of mode-coupling theory (MCT). We monitor the intermediate
incoherent as well as the coherent chain and coherent melt scattering functions
over a wide range of wave numbers q. Upon approaching Tc the coherent
alpha-relaxation time of the melt increases strongly close to the maximum of
the static structure factor of the melt. At q corresponding to the radius of
gyration of the chain the melt relaxation time exhibits another maximum. The
temperature dependence of the relaxation times is well described by a power-law
with a q-dependent exponent in an intermediate temperature range. The
time-temperature superposition principle of MCT is clearly bourne out in the
whole range of wave numbers. An analysis of the alpha-decay using
Kohlrausch-Williams-Watts (KWW) functions reveals that the collective melt
KWW-stretching exponent and KWW-relaxation times are modulated with the
structure factor. Furthermore, both incoherent and coherent KWW-times approach
the large-q prediction of MCT at q comparable to the maximum of the structure
factor. At small q a power law with exponent -3 is found for the coherent chain
KWW-times similar to that of recent experiments.
