For Anode Foil we have a term and definition in Capacitors.

Anode Foil (Capacitors)

An aluminum electrolytic capacitor is typically composed of an anode foil, a cathode foil and separator material which are wound together and impregnated with an electrolyte. The anode foil has an aluminum oxide layer acting as the dielectric. After the aluminum foil (65 to 100 microns) is electrochemically etched to increase it's surface area, the dielectric is produced by anodic oxidation of its surface.
Increasing the surface area of the foil serves to increase its unit capacitance after it is anodized.

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