I am conducting a Rietveld refinement of smectites in Profex using the structural model of Ufer et al. (2004). I would like to know if it is possible to refine the shifting parameters of the interlayer complex in the x and y directions, as well as the Eulerian angles. I have refined these parameters; however, I’m unsure if the model supports the refinement of these parameters and whether the values I obtained are consistent. My study involves Ca-saturated dioctahedral smectite. The refined values I obtained are:

• xx = 0.7457 ± 0.0040
• yy = 0.3185 ± 0.0062
• ϕ1 = 224.3 ± 2.6
• ϕ2 = 53.9 ± 1.9
• ϕ3 = -127.7 ± 2.1

Thank you for your assistance!