On preparation of the doubly oriented iodine-nylon 6 complex through iodine doping, modified double orientation is observed by X-ray diffraction. In iodine doping, double orientation of the complex is occasionally modified in the central part of a long strip of the doubly oriented specimen. Hydrogen-bonded planes of nylon 6 chains are oriented perpendicular to both film surfaces of the specimen with modified orientation, while in normal doubly oriented specimens the planes are oriented parallel to the surfaces, as in the nylon 6 alpha-form. Even in the modified specimens, the orientation of the chain axis is maintained parallel to the draw direction. Iodine doping gives rise to rotation of double orientation at an angle of 90-degrees about the draw direction. The modification is thought to be due to diffusion of polyiodide ions through the film surfaces of the specimen.