Fig. 5

a Overview of the cell corner (4.5 × 4.5 µm²) imaged in AC mode. b–d 1 × 1 µm² height-, corresponding, e–g phase- and h–j fast Fourier transformed images. The transition was scanned from b the S₂ to d the compound middle lamella. All corresponding images are set to the same scale, the radial direction points from right to left. No color scale is shown for the FFT phase image as the image information could not be transferred during the FFT. The white arrow points to the directionality of the S₁₂ layer