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UGC 3995 is an interacting and occulting galaxy pair. UGC 3995B is aforeground face-on spiral and UGC 3995A a bright background spiral with an AGN.We present analysis of the dust in the disc of UGC 3995B based on archivalHubble Space Telescope WFPC2 and PPAK IFU data from the CALIFA survey's firstdata release.  From the HST F606W image, we construct an extinction map by modeling theisophotes of the background galaxy UGC 3995A and the resulting transmissionthrough UGC 3995B. This extinction map of UGC 3995B shows several distinctspiral extinction features. The radial distribution of $A_V$ values declinesslowly with peaks corresponding to the spiral structures. The distribution of$A_V$ values in the HST extinction map peaks near $A_V = 0.3-0.4$. Beyond thispoint, the distribution of $A_V$ values drops like an exponential: $N(A_V) =N_0 \times e^{(-A_V/0.5)}$. The 0.5 value is higher than typical for a spiralgalaxy. The outer arms may be tidally distended; the extinction in thecorresponding interarm regions is small to an unusually small radius.  To analyse the PPAK IFU data, we take the ratio of a fibre spectrum in theoverlap region and the corresponding background fiber spectrum to construct anextinction curve. We fit the Cardelli, Clayton and Mathis (CCM) curve to theextinction curve of each fiber element in the overlap region. A map of theextinction constructed from PPEX IFU data-cubes shows the same spiral structureof the HST extinction map but the some differences in the distribution of thenormalization of the CCM fits ($A_V$). The inferred extinction slopes ($R_V$)maps do not display any structure and a range of values partly due to thesampling effects of the disc by fibers, sometimes due to bad fits, and possiblypartly due to some reprocessing of dust grains in the interacting disc.(abridged)

The Occulting Galaxy Pair UGC 3995; Dust properties from HST and CALIFA data