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Nonplanarity Index for Fused Benzenoid Hydrocarbons

The sparse data on nonlanarity of fused polycyclic aromatic hydrocarbons (PAHs) is brought into focus with this critical review. The Sander and Wise thickness index is advocated as a quantitative measure of nonplanarity for PAHs. Some rules for determining the relative degrees of nonplanarity are formulated. Some comparisons among related members of benzenoid sets are presented.