Magnetic orientation of poly(ethylene-2,6-naphthalate) [PEN], reported in the previous paper, was studied in detail. Birefringence, X-ray and infrared analyses were carried out on the samples quenched at different periods of the crystallization time during the crystallization at 255 degrees C in the magnet (6T). These analyses showed that the orientation observed in the birefringence measurements starts during the induction period in which little crystallinity is observed with respect to the X-ray and infrared measurements. At a later stage of crystallization, the samples exhibited the orientation of crystallites with the c-axis parallel to the magnetic field.