We present a procedure that will enable the extraction of molecular axis alignment from evolving photoelectron angular distributions measured following (1+1) resonance-enhanced multiphoton ionization in which the first step prepares the initial alignment. This procedure is applicable to a picosecond time- and angle-resolved photoelectron spectroscopy experiment [such as the one presented by Reid et al., J. Chem. Phys. 111, 1438 (1999)], and relies on the radial dipole matrix elements for the ionization process having no time dependence on the time scale of the experiment. As an illustration, we present a model calculation of the evolution of photoelectron angular distributions expected following the ionization of a prepared pure rotational wavepacket. (C) 2000 American Institute of Physics. [S0021-9606(00)00608-5].