An electronic apparatus has a first attachment portion to which a first component can be attached to the front of the apparatus body, and a second attachment portion which has a substantially same construction as the first attachment portion and to which a second component can be attached to the rear of the apparatus body. In one aspect, an assembly including a substrate, a first insulator disposed on the substrate, a second insulator disposed on the first insulator, and a 2D material disposed on the second insulator is formed. In particular, the signal generation is based upon the affected population or object within the area of interest. The nonconductive layer may be fabricated by forming two dielectric layers which have therebetween an etch stop layer with openings, and then simultaneously etching both of the dielectric layers.