adds chained request from layer to pld target

src/main.py

@@ -84,7 +84,15 @@ def chain_entrypoint_to_layers(sample_object):
     layer_object_list.sort(key=lambda x: x.layer_number)
     return layer_object_list
 
+def chain_layer_to_target(layer_object):
+    '''
+    Takes a Layer-class object, looks at its .target_elabid attribute and returns a Material-class object containing data on the PLD target used in the deposition of said layer.
 
+    Dependency: call_material_from_elabid.
+    '''
+    target_elabid = layer_object.target_elabid
+    material_object = call_material_from_elabid(target_elabid)
+    return material_object
 
 #sample_object = call_entrypoint_from_elabid(elabid)
 #from_entrypoint_to_material(sample_object)
@@ -97,13 +105,17 @@ if __name__=="__main__":
     elabid = input("Enter elabid of your starting sample [default= 1111]: ") or 1111
     data = APIHandler(apikey).get_entry_from_elabid(elabid)
     sample = Entrypoint(data)
-    layers = chain_entrypoint_to_layers(sample)
+    batch = chain_entrypoint_to_batch(sample) # Material-class object
+    layers = chain_entrypoint_to_layers(sample) # list of Layer-class objects
     print(f"Sample name:\n{sample.name}\n")
+    print(f"Substrate data:\n{batch.get_compound_formula(apikey)}\n")
     print(f"Layers data:")
     for layer in layers:
         ld = layer.__dict__
         ld.pop("extra")
+        tgt = chain_layer_to_target(layer)
         print(ld)
+        print(tgt.get_compound_formula(apikey) + f"\n")
 
     # entryType = None
     # while entryType not in ["items", "experiments"]: