Addition of a new L3A cloud folding algorithm to better detect and flag instances when clouds above 15 km are folded down to the lower few km of the profile; Detection and flagging of layers that are wholly below ground and thus folded; Detection and flagging of folded layers that straddle ground; Setting the layer_attr parameter to a value of 11 when a layer is determined to be folded from above 15 km; Changes to the structure of the layer detection algorithm (DDA) to enable execution of N passes of the DDA; Improved thin layer detection.