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A recent experiment reported a two-order-of-magnitude enhancement of the cross section for double atomic-field bremsstrahlung when compared to various theoretical formulations. In this paper we propose to explain the observed coincidence rate in terms of the coherent emission of two thick-target bremsstrahlung photons from the Mylar vacuum window by electrons elastically scattered in the target. The photon energy dependence of the coincidence rate predicted by this thicktarget double bremsstrahlung (TTDB) model is estimated and compared to the previous experimental results for a gold target. Fairly good agreement is obtained with both the order of magnitude of the coincidence rate and its photon energy dependence, even though a crude approximation is used to estimate the TTDB distribution from the better known thick-target single bremsstrahlung spectrum.

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