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   72135
   We propose to complete a hard X-ray survey of a large, unbiased sample
   of type 2 Seyfert galaxies in order to explore the universality of the
   unified Seyfert model and the contribution of Seyfert 2s to the cosmic
   X-ray background (XRB). The new observations, in combination with
   archived ASCA data, will be used to search for previously undetected
   hidden type 1 nuclei, to construct an unbiased composite Seyfert 2
   spectrum, and to measure the local volume emissivity of these objects.
   In combination with the array of multiwavelength data we have for this
   sample (complete radio, IR, and optical spectropolarimetry), these
   results will be used to test models for a Seyfert 2-dominated XRB.
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