Table 1.

Comparison between different skin layers.

	Stratum Corneum	Viable Epidermis	Dermis
Composition	Corneocytes embedded in lipid matrix, tightly stacked and overlapping each other	Stratum lucidum, stratum granulosum, stratum spinosum, and stratum basale.	Papillary layer, reticular layer, blood vessel, lymph and nerve system
Hydrophilicity	no	yes	yes
Impedance	>${10}^5$ Ω	>${10}^4$ Ω	>${10}^4$ Ω
Thickness	Tens of microns	150 μm	500 μm~2 mm