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In this work we present the galaxy clustering measurements of the two DESlens galaxy samples: a magnitude-limited sample optimized for the measurementof cosmological parameters, MagLim, and a sample of luminous red galaxiesselected with the redMaGiC algorithm. MagLim / redMaGiC sample contains over 10million / 2.5 million galaxies and is divided into six / five photometricredshift bins spanning the range $z\in[0.20,1.05]$ / $z\in[0.15,0.90]$. Bothsamples cover 4143 deg$^2$ over which we perform our analysis blind, measuringthe angular correlation function with a S/N $\sim 63$ for both samples. In acompanion paper (DES Collaboration et al. 2021)), these measurements of galaxyclustering are combined with the correlation functions of cosmic shear andgalaxy-galaxy lensing of each sample to place cosmological constraints with a3$\times$2pt analysis. We conduct a thorough study of the mitigation ofsystematic effects caused by the spatially varying survey properties and wecorrect the measurements to remove artificial clustering signals. We employseveral decontamination methods with different configurations to ensure therobustness of our corrections and to determine the systematic uncertainty thatneeds to be considered for the final cosmology analyses. We validate ourfiducial methodology using log-normal mocks, showing that our decontaminationprocedure induces biases no greater than $0.5\sigma$ in the $(\Omega_m, b)$plane, where $b$ is galaxy bias. We demonstrate that failure to remove theartificial clustering would introduce strong biases up to $\sim 7 \sigma$ in$\Omega_m$ and of more than $4 \sigma$ in galaxy bias.

Dark Energy Survey Year 3 Results: Galaxy clustering and systematics treatment for lens galaxy samples