The energy spectra and the electric and magnetic properties of one-dimensional (1D) stacks consisting of
conjugated π-electron systems (polycyclic aromatic hydrocarbons and polymethines) with Tamm defects are
investigated theoretically by means of the many-electron band theory. The conditions for the relative
arrangement of the stacks in terms of the slip parameters for yielding different magnetic and electric ground-state properties are studied.
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