Single-chain folding: expected structure and kinetics Single CG P(NDI2OD-T2) chains were studied in the poor solvent for flexible and regular-flexibility backbones of length 10, 20, and 30 monomers. 40mers were considered only for the regularflexibility chains. The single-chain conformation was characterised by the radius of gyration R g and shape anisotropy κ 2 , defined as