  We describe the angular power spectrum of unresolved 3.6 micron IR light in
Spitzer GOODS fields. The amplitude of the anisotropy spectrum decreases with
decreasing flux threshold to which resolved sources are removed from images.
When all pixels brighter than a Vega magnitude of 24.6 are removed, the
amplitude of the power spectrum at arcminute angular scales can be described
with an extra component of z>8 sources with a IRB contribution around 0.4 nW
m^-2 sr-1. The shape of the power spectrum, however, is more consistent with
that expected for unresolved, faint galaxies at lower redshifts with Vega
magnitudes fainter than 23 with a total 3.6 micron intensity between 0.1 to 0.8
nW m^-2 sr^-1. We confirm this assumption by showing that large-scale power
decreases rapidly when the unresolved clustering spectrum is measured from a
processed HDF-N IRAC image where locations of faint ACS sources with no IR
counterparts were also masked. Based on resolved counts and unresolved
fluctuations, we find that, at most, about 7.0 nW m^-2 sr^-1 can be ascribed to
galaxies.
