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. 2014 Feb 7;4:4020. doi: 10.1038/srep04020

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(a). Multilayer drug delivery system in the form of a crossing strip of printed riboflavine sodium phosphate (RSP) layer between two layers of hydroxypropyl methylcellulose (HPMC) film reconstructed from a SWLI measurement. (b). Structure of hydroxypropyl –cellulose (HPC) film on a PET surface revealing up to 13 μm tall delamination, 0.31 μm (Sq1) and 0.20 μm (Sq2) surface roughness. (Left) Measured interferences, (Inserts top right) Schematic of the samples.We can determine surface topology with high resolution and we can determine presence of disbonds in multilayer structures.