Cover: The article by Potemkin and coworkers provides free‐energy considerations to explain the molar mass dependent morphology of lamellar diblock copolymer thin films of poly(styrene‐b‐butadiene). Atomic force microscopy (AFM) and grazing‐incidence small‐angle scattering (GISAXS) data were instrumental to establish the lamellar orientation as a function of the interaction parameter χN and the ratio of film thickness over lamellar thickness Dred. The relevant free‐energy contributions are discussed that determine the boundary between the observed orientational phases. Further details can be found in the article by I. I. Potemkin,* P. Busch, D.‐M. Smilgies, D. Posselt, and C. M. Papadakis on page 579.