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We demonstrate that the surface topography of a sample can be reconstructed from electron backscatter diffraction (EBSD) patterns collected with a commercial EBSD system. This technique combines the location of the maximum background intensity with a correction from Monte Carlo simulations to determine the local surface normals at each point in an EBSD scan. A surface height map is then reconstructed from the local surface normals. In this study, a Ni sample was machined with a femtosecond laser, which causes the formation of a laser-induced periodic surface structure (LIPSS). The topography of the LIPSS was analyzed using atomic force microscopy (AFM) and reconstructions from EBSD patterns collected at 5 and 20 kV. The LIPSS consisted of a combination of low frequency waviness due to curtaining and high frequency ridges. The morphology of the reconstructed low frequency waviness and high frequency ridges matched the AFM data. The reconstruction technique does not require any modification to existing EBSD systems and so can be particularly useful for measuring topography and its evolution during in situ experiments.
Strange as it seems, the infamous Smoot-Hawley Tariff might have had an expansionary effect on the U.S. economy. Basic macroeconomic principles indicate that the direct effect of a tariff increase is expansionary. This expansionary effect might be offset by retaliatory increases in foreign tariffs. Barry Eichengreen has recently questioned whether significant retaliation to Smoot-Hawley occurred. This article demonstrates that the tariff increases enacted during 1930 in Canada—the largest trading partner of the United States—were in direct response to Smoot-Hawley. The conventional wisdom that Smoot-Hawley hurt the U.S. economy may be right after all.