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The structure of micellar solutions is determined from X‐ray small‐angle scattering measurements on an absolute scale. The most probable structure is chosen by comparison with spherical cylindrical and lamellar models. This method is applied to two‐component micelles and it is possible to follow the variation of micellar dimensions when the concentration of each component is varying.

The interpretation of self-diffusion and conductivity studies shows the existence of a zone within the isotropic microemulsion domain, where the aqueous and oily phase are both continuous. The boundary of this zone is strongly but not uniquely related to the water volume fraction of the system