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We report on observations of the neutron star (NS) residing in the low-massX-ray binary 1RXS J180408.9-34205 taken 2015 March by $\emph{NuSTAR}$ and$\emph{XMM-Newton}$ while the source was in the hard spectral state. We findmultiple reflection features (Fe K$_{\alpha}$ detected with $\emph{NuSTAR}$; NVII, O VII, and O VIII detected in the RGS) from different ionization zones.Through joint fits using the self consistent relativistic reflection model {\screlxill}, we determine the inner radius to be $\leq 11.1\ R_{g}$. For a 1.4M$_{\odot}$ NS with a spin of $a_{*}=0$, this is an inner disk radius of$\leq22.2$ km. We find the inclination of the system to be between$18^{\circ}$-$29^{\circ}$. If the disk is truncated at a radius greater thanthe neutron star radius, it could be truncated by a boundary layer on theneutron star surface. It is also possible that the disk is truncated at themagnetospheric radius; conservative estimates would then imply $B\leq(0.3-1.0)\times10^{9}$ G at the magnetic poles, though coherent pulsations have notbeen detected and the source is not identified as a pulsar.

NuSTAR and XMM-Newton Observations of the Neutron Star X-ray Binary 1RXS J180408.9-34205