  The two-body t-matrix is calculated directly as function of two vector
momenta for different Malfliet-Tjon type potentials. At a few hundred MeV
projectile energy the total amplitude is quite a smooth function showing only a
strong peak in forward direction. In contrast the corresponding partial wave
contributions, whose number increases with increasing energy, become more and
more oscillatory with increasing energy. The angular and momentum dependence of
the full amplitude is studied and displayed on as well as off the energy shell
as function of positive and negative energies. The behavior of the t-matrix in
the vicinity of bound state poles and resonance poles in the second energy
sheet is studied. It is found that the angular dependence of T exhibits a very
characteristic behavior in the vicinity of those poles, which is given by the
Legendre function corresponding to the quantum number either of the bound state
or the resonance (or virtual) state. This behavior is illustrated with
numerical examples.
