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(a) Equivalent electrical model for a capacitive sensing electrode with a voltage follower. Reproduced with permission from ref. [341]. Copyright 2014, Elsevier. (b) Electrode with multilayer structure through capacitive coupling. (c) Wrinkles of the stretchable electrode with the skin surface. (b,c) Reproduced with permission from ref. [346], Copyright 2018, Wiley-VCH.
