  We present a Quantum Monte Carlo study of the temperature dependent dynamics
of the two-dimensional Kondo insulator. Working at the so-called symmetrical
point allows to perform minus-sign free QMC simulations. Study of the
temperature dependence of the single-particle Green's function and the
dynamical spin correlation function provides evidence for two characteristic
temperatures, which we associate with the Kondo and coherence temperature,
whereby the system shows a metal-insulator transition at the coherence
temperature. The data shows evidence for two distinct types of spin excitations
and we show that despite strong antiferromagnetic ordering at low temperature
the system cannot be described by spin-density-wave theory.
