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Eight-layer model and four-layer model. Stratum corneum (SC, 10 μm), epidermis (ED, 80 μm), papillary dermis (PD, 100 μm), reticular dermis (RD, 1500 μm), and dermis (160 μm) all have the same optical properties in the model. Upper blood plexus (UBP, 80 μm); lower blood plexus (LBP, 70 μm); subcutaneous fat (2 mm) had only refractive index (1.46) in these two models. SC+EP+PD+UBP=upper dermis (270 μm); RD=dermis (1500 μm); LBP+dermis=deep dermis (230 μm).
