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We develop new tools for continuum and spectral stacking of ALMA data, andapply these to the ALMA Lensing Cluster Survey (ALCS). We derive average dustmasses, gas masses and star formation rates (SFR) from the stacked observed260~GHz continuum of 3402 individually undetected star-forming galaxies, ofwhich 1450 are cluster galaxies and 1952 field galaxies, over three redshiftand stellar mass bins (over $z = 0$-1.6 and log $M_{*} [M_{\odot}] = 8$-11.7),and derive the average molecular gas content by stacking the emission linespectra in a SFR-selected subsample. The average SFRs and specific SFRs of bothcluster and field galaxies are lower than those expected for Main Sequence (MS)star-forming galaxies, and only galaxies with stellar mass of log $M_{*}[M_{\odot}] = 9.35$-10.6 show dust and gas fractions comparable to those in theMS. The ALMA-traced average `highly obscured' SFRs are typically lower than theSFRs observed from optical to near-IR spectral analysis. Cluster and fieldgalaxies show similar trends in their contents of dust and gas, even when fieldgalaxies were brighter in the stacked maps. From spectral stacking we find apotential CO ($J=4\to3$) line emission (SNR $\sim4$) when stacking cluster andfield galaxies with the highest SFRs.

ALMA Lensing Cluster Survey: average dust, gas, and star formation properties of cluster and field galaxies from stacking analysis