  We investigate the collective scattering of coherent light from a thermal
alkali-metal vapor with temperatures ranging from 350 to 450 K, corresponding
to average atomic spacings between $0.7 \lambda$ and $0.1 \lambda$. We develop
a theoretical model treating the atomic ensemble as coherent, interacting,
radiating dipoles. We show that the two-time second-order correlation function
of a thermal ensemble can be described by an average of randomly positioned
atomic pairs. Our model illustrates good agreement with the experimental
results. Furthermore, we show how fine-tuning of the experimental parameters
may make it possible to explore several photon statistics regimes.
