Figure 2.

The calculated and the experimentally observed roll, tilt, shift and slide. The filled circles correspond to the experimental data taken from Reference (7), and the hollow squares show the calculated results using A₁ = 75 nm, A₂ = 37 nm, and G = 25 nm. In the calculation process, the twist angles are directly read off from the experimental data of Richmond and Davey. We can see a strong coupling between twist, roll and slide. The negative values of the roll and positive values of the slide are in good agreement with the experimental results.