  The a.c. electric field distribution is studied in a composite, containing
materials with small local losses. The possibility that 2D two-component system
can have effective absorption in the absence of local absorption was evidented.
We study the second and higher moments of electric field and show that they
diverge with the decrease of local absorption. The 3D system near the
percolation threshold is also discussed. The observation of giant field
fluctuations in granular films is explained.

Disordered Systems and Neural Networks;Mesoscale and Nanoscale Physics