Analysis of anisotrophy of small-angle neutron scattering of polyethylene single crystals. Erratum

In the paper by Sadler [J. Appl. Cryst. (1983). 16, 519–523] a factor of 2 was omitted in error in equation (10), which should read: 〈z²〉 = 〈a〉 + 〈b〉[1 + 2/〈P₂(γ)〉]/3. The results in Table 1 were derived correctly from the data.