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We propose three different lattice operators to measure the intrinsic width\xi_I of the chromoelectric flux tube in pure lattice gauge theories. In orderto test these proposals we evaluate them for SU(2) and Ising LGTs in (2+1)dimensions in the vicinity of the deconfinement transition. Using dimensionalreduction, we could perform the calculation in the effective 2d spin modelusing standard S-matrix techniques. We consistently found the same result forthe three lattice operators. This result can be expressed in terms of thefinite temperature string tension as follows \xi_I=\frac{T}{2\sigma(T)} andimplies that the intrinsic width of the flux tube diverges as the deconfinementtransition is approached.

On the intrinsic width of the chromoelectric flux tube in finite temperature LGTs