diff --git a/gibbon-compiler/src/Gibbon/L2/Syntax.hs b/gibbon-compiler/src/Gibbon/L2/Syntax.hs
index 2c4e678f..5ae3d2ee 100644
--- a/gibbon-compiler/src/Gibbon/L2/Syntax.hs
+++ b/gibbon-compiler/src/Gibbon/L2/Syntax.hs
@@ -197,8 +197,10 @@ data PreLocExp loc = StartOfRegionLE Region
                    | FreeLE
                    | FromEndLE  loc
 
-                   | AfterVectorLE [PreLocExp loc]
-
+                   | AfterSoALE (PreLocExp loc) [PreLocExp loc] loc  -- Compute new SoA location from an old SoA location 
+								     -- (PreLocExp loc) -> expression for arithmetic on data constructor buffer 
+								     -- [PreLocExp loc] -> expressions for arithmetic on each field location 
+								     -- loc, store the old loc, why? -- capture more metadata, also style
 
   deriving (Read, Show, Eq, Ord, Functor, Generic, NFData)
 
diff --git a/gibbon-compiler/src/Gibbon/Passes/InferLocations.hs b/gibbon-compiler/src/Gibbon/Passes/InferLocations.hs
index 61fdb772..2977c502 100644
--- a/gibbon-compiler/src/Gibbon/Passes/InferLocations.hs
+++ b/gibbon-compiler/src/Gibbon/Passes/InferLocations.hs
@@ -276,15 +276,16 @@ data Failure = FailUnify Ty2 Ty2
 -- | Constraints here mean almost the same thing as they do in the L2 type checker.
 -- One difference is the presence of an AfterTag constraint, though I'm not opposed to
 -- adding one to the L2 language for symmetry.
--- [2024.12.04] VS
--- For AfterConstantL and AfterVariableL add a list argument with offsets for fields in an SoA location 
--- Optional for AoS Location. 
+-- [05.12.2024] 
+-- VS: add AfterSoAL for a new location after an SoA location. 
+-- first contraint is for a data constructor buffer and list of constraints for the fields.  
 data Constraint = AfterConstantL LocVar Int LocVar
                 | AfterVariableL LocVar Var LocVar
                 | AfterTagL LocVar LocVar
                 | StartRegionL LocVar Region
                 | AfterCopyL LocVar Var Var LocVar Var [LocVar]
                 | FreeL LocVar
+                | AfterSoAL LocVar Constraint [Constraint] LocVar
                   deriving (Show, Eq, Generic)
 
 instance Out Constraint