The deformation behaviour of amorphous poly(aryl ether ether ketone) films above the glass transition temperature is studied by analysing the amorphous orientation function and shrinkage stress variations versus draw ratio in the framework of the two component model of Brown and Windle which considers separate orientational and extensional contributions to the overall strain. This analysis is in line with our previous conclusion of the existence of two regimes dominated by orientation of rigid structural units and extension of the chains before and after the threshold of the strain-induced crystallization, respectively. Also supported is the disentanglement trend of the chains prior to the crystallization which brings about a physical crosslinking effect to the macromolecular network. The identification of the rigid structural unit with a single monomer unit is remarkably consistent with our previous determination of the size of the random link. The study of isothermally-crystallized samples supports the conclusion about the efficiency of the crystallites for preventing chain slippage. The estimation of the molecular weight between entanglements as a function of draw ratio for both amorphous and crystallized samples suggests that the physical crosslinking effect of the crystallites is much more efficient than the intertwining of the chains.