  Cyclotron resonance at microwave frequencies is used to measure the band mass
(m_b) of the two-dimensional holes (2DH's) in carbon-doped (100)
GaAs/AlxGa1-xAs heterostructures. The measured m_b shows strong dependences on
both the 2DH density(p) and the GaAs quantum well width (W). For a fixed W, in
the density range (0.4x10^11 to 1.1x10^11 cm^-2) studied here, m_b increases
with p, consistent with previous studies of the 2DHs on the (311)A surface. For
a fixed p = 1.1x10^11 cm^-2, mb increases from 0.22 m_e at W = 10 nm to 0.50
m_e at W = 30 nm, and saturates around 0.51 m_e for W > 30 nm.
