  We present the results from the Fourier Resolved Spectroscopy of archival
XMM-Newton data of five AGN, namely, Mrk 766, NGC 3516, NGC 3783, NGC 4051 and
Ark 564. This work supplements the earlier study of MCG-6-30-15 as well as
those of several Galactic Black Hole Candidate sources. Our results exhibit
much larger diversity than those of Galactic sources, a fact we attribute to
the diversity of their masses. When we take into account this effect and
combine our results with those from Cyg X-1, it seems reasonable to conclude
that, at high frequencies, the slope of the Fourier-resolved spectra in
accreting black hole systems decreases with increasing frequency as
proportional to f^{-0.25}, irrespective of whether the system is in its High or
Low state. This result implies that the flux variations in AGN are accompanied
by complex spectral slope variations as well. We also find that the Fe Ka line
in Mrk 766, NGC 3783 and NGC 4051 is variable on time scales ~day - 1 hour. The
iron fluorescence line is absent in the spectra of the highest frequencies,and
there is an indication that, just like in Cyg X-1, the equivalent width of the
line in the Fourier-resolved of AGN decreases with increasing frequency.
