Back Cover: Kinetic analysis of the thermal behavior ofatactic, syndiotactic, and isotactic polystyrene suggeststhat the larger stability of the isotactic form is associatedwith an increase in the activation energy and a decrease inthe values of the rate constant as well as the reactionmodel and can be explained by intramolecular confine-ment. Further details can be found in the article byK. Chen, K. Harris, and S. Vyazovkin* on page 2525.