| http://www.w3.org/ns/prov#value | - The thickness of the first layer coming in contact with the skin 4 in the embodiments of flat body electrodes described above ranges preferably from 800 ??m to 2,500 ??m, and with particular preference from 1,000 ??m to 2,000 ??m, while the thickness of the covering second layer 5 preferably ranges from 500 ??m to 2,500 ??m, and especially from 1,000 ??m to 2,000 ??m.
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