Geometry-defined electrical interconnection by a homogeneous medium.

We describe a geometry-defined electrical interconnection medium based on a composite of small metal particles dispersed uniformly in an elastomer or adhesive matrix. The volume concentration of metal particles, p, is just below the critical value, p (c), which corresponds to the percolation threshold. The long range electrical conductivity of such a composite changes abruptly from that of an insulator to that of a metal (a change by a factor as high as 10(15)) as p crosses the threshold value.