A thin block copolymer film forming alternating sheet-like domains. Domain period, film thickness and the preferences of both boundaries constrain orientation and termination.
A boundary has approximately equal interfacial free energies against the two blocks. One neutral boundary does not remove selectivity at the other boundary.
The two boundaries prefer opposite blocks. In a simple parallel lamellar stack, opposite terminations favour half-integer repeat thicknesses.
The two boundaries prefer the same block. Parallel lamellae then tend to favour matching terminations and integer-period commensurability.
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