Four to five lamellar orders (Fig. 9a) were recorded by specular and offset (longitudinal diffuse) scans. Unfortunately, the specular condition (angular alignment) was lost in some of the scans, so that the diffuse offset scans, which by nature are less sensitive to angular misalignment and which show strong lamellar reflections, were used for the Fourier synthesis analysis. Due to the difficulties associated with low energies around the I-L III edge and the intrinsically small anomalous difference signal, all experiments were repeated on an in-house diffractometer without any risk of radiation damage during long scanning and with most careful alignment procedures. The one-dimensional swelling method was used to yield the phases t n .