Conductors in a 3D circuit that include horizontal lines with a plurality of vertical extensions in high aspect ratio trenches can be formed using a two-step etching procedure. An interface component can receive at least one geographic destination. Two contact parts are respectively extended from two ends of the main part along a first direction, and each of the contact parts has a plurality of tips. The electrode layers are separated by dielectric layer. Also, the one or more magnetic cores and the one or more conductive coils are configured so that heat created by currents induced in the roll by the magnetic fluxes produces a steady state thermal profile on a surface of the roll. Where values are determined for a plurality of activity metrics, the list may be ordered according to the one of the activity metrics selected by the user.