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A method is described which provides an efficient way of analysing degrees of anisotropy in small-angle scattering. It is applied to isotopic mixtures of polyethylene crystallized from solution, and to the same system which has been annealed (heat treated). The degree of orientation of the lamellar crystallites is measured separately. The results can then be given in terms of molecular dimensions along and at right angles to the lamellar normals. It is found that each molecule is probably restricted to one lamella, and that its dimension along the lamellar normal increases on annealing.