Patent ID: 7651735

Claim:
A method, comprising: forming a first film inside at least one trough, said at least one trough integrally disposed on an energetically neutral surface layer of a substrate, said at least one trough comprising a substantially planar first sidewall and a substantially planar second sidewall opposite said first sidewall, wherein said first sidewall and said second sidewall are substantially normal to said energetically neutral surface layer, said first and said second sidewalls being separated by a distance corresponding to a width of a bottom surface of said at least one trough, said first film comprising a first block copolymer; assembling line-forming microdomains of said first block copolymer within said first film, said line-forming microdomains of said first block copolymer forming first self-assembled structures within said first film, said first self-assembled structures oriented substantially normal to said first sidewall and said second sidewall and substantially parallel to said energetically neutral surface layer; removing at least one microdomain from said first film such that oriented structures remain in said trough, wherein said oriented structures are oriented substantially normal to said first sidewall and said second sidewall and substantially parallel to said surface layer; forming a second film inside said at least one trough, said second film comprising a second block copolymer; and assembling line-forming microdomains of said second block copolymer within said second film, said line-forming microdomains of said second block copolymer forming second self-assembled structures within said second film, said second self-assembled structures oriented substantially normal to said oriented structures and substantially parallel to said first sidewall and said second sidewall.