XY-like incommensurate magnetic order in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>Ce</mml:mi> <mml:mn>2</mml:mn> </mml:msub> <mml:msub> <mml:mi>SnS</mml:mi> <mml:mn>5</mml:mn> </mml:msub> </mml:mrow> </m

We report the synthesis of single crystals of ${\mathrm{Ce}}_{2}{\mathrm{SnS}}_{5}$ through a two-stage chemical vapor transport method. The ${\mathrm{Ce}}_{2}{\mathrm{SnS}}_{5}$ system is a member of the orthorhombic Pbam (No. 55) space group and realizes a distorted trigonal tricapped prism (TTP) crystal field around each cerium site. We characterized the sample through orientation-dependent magnetization and heat capacity measurements to probe the magnetic anisotropy in the system characteristic of XY-like anisotropic Heisenberg model behavior. ${\mathrm{Ce}}_{2}{\mathrm{SnS}}_{5}$ furthermore enters a zero-field ordered phase under ${T}_{N}=2.4\phantom{\rule{0.16em}{0ex}}\text{K}$; powder neutron diffraction measurements reveal incommensurate magnetic order near ${T}_{N}$. The system then locks into a commensurate, two-$q$ magnetic structure below approximately $1.2\phantom{\rule{0.16em}{0ex}}\text{K}$. This commensurate structure belongs to the Shubnikov group $P{b}^{\ensuremath{'}}{a}^{\ensuremath{'}}{m}^{\ensuremath{'}}\phantom{\rule{0.16em}{0ex}}(\mathrm{MSG}\phantom{\rule{0.28em}{0ex}}55.359)$ and realizes the propagation vectors $\stackrel{P\vec}{q}=(1/3,0,0)$ and $\stackrel{P\vec}{q}=(0,0,0)$.