Whilst the onset of the Q* peak can be linked to the ordering of the cylinders in 2NapFF-Na, the situation is different for 2NapFF-TBA. The 2D SAXS patterns show very little ordering, and this order is not linearly related to concentration (Figure and Figure ). Furthermore, a Q* peak appears in sample concentrations where no alignment is observed. This shows that the cylinders in 2NapFF-TBA are interacting at lower concentration but are unable to align in the manner seen for the Na analogue, again indicative of micellar branching. To test this hypothesis, we examined low-shear viscosity as a function of concentration which can indicate where changes in structure occur. At a shear rate of 1 s -1 (Figure , example data Figure , full data Figures and), the viscosity of the solutions mirrors the plot of <P2>. The wormlike micelles formed by 2NapFF-Na can be aligned in a magnetic field. The degree of alignment is again concentration dependent (Figure ), and correlates with the <P2> data.