A multiple mask and a multiple masking layer technique can be used to
pattern a single IC layer. A resolution enhancement technique can be used
to define one or more fine-line patterns in a first masking layer,
wherein each fine-line feature is sub-wavelength. Moreover, the pitch of
each fine-line pattern is less than or equal to that wavelength. The
portions of the fine-line features not needed to implement the circuit
design are then removed or designated for removal using a mask. After
patterning of the first masking layer, another mask can then be used to
define coarse features in a second masking layer formed over the
patterned first masking layer. At least one coarse feature is defined to
connect two fine-line features. The IC layer can be patterned using the
composite mask formed by the patterned first and second masking layers.