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Measurements of the reflectivity of a 2-D electron gas are used to deduce thepolarization of the Composite Fermion hole system formed for Landau leveloccupancies in the regime 1<\nu<2. The measurements are consistent with theformation of a mixed spin CF system and allow the density of states or`polarization' effective mass of the CF holes to be determined. The mass valuesat \nu=3/2 are found to be ~1.9m_{e} for electron densities of 4.4 x 10^{11}cm^{-2}, which is significantly larger than those found from measurements ofthe energy gaps at finite values of effective magnetic field.Comment: 4 pages, 3 fig

Measurements of composite fermion masses from the spin polarization of two-dimensional electrons in the region 1<ν<2