Index: trunk/src/layer_grp.c
===================================================================
--- trunk/src/layer_grp.c	(revision 19735)
+++ trunk/src/layer_grp.c	(revision 19736)
@@ -1013,6 +1013,18 @@
 
 const pcb_dflgmap_t *pcb_dflgmap_last_top_noncopper = pcb_dflgmap+2;
 const pcb_dflgmap_t *pcb_dflgmap_first_bottom_noncopper = pcb_dflgmap+6;
+const pcb_dflgmap_t pcb_dflg_top_copper = {
+	"top_copper",          PCB_LYT_TOP | PCB_LYT_COPPER, 0, 0
+};
+const pcb_dflgmap_t pcb_dflg_int_copper = {
+	"int_copper",          PCB_LYT_INTERN | PCB_LYT_COPPER, 0, 0
+};
+const pcb_dflgmap_t pcb_dflg_substrate = {
+	"substrate",           PCB_LYT_INTERN | PCB_LYT_SUBSTRATE, 0, 0
+};
+const pcb_dflgmap_t pcb_dflg_bot_copper = {
+	"bot_copper",          PCB_LYT_BOTTOM | PCB_LYT_COPPER, 0, 0
+};
 
 void pcb_layergrp_set_dflgly(pcb_board_t *pcb, pcb_layergrp_t *grp, const pcb_dflgmap_t *src)
 {
Index: trunk/src/layer_grp.h
===================================================================
--- trunk/src/layer_grp.h	(revision 19735)
+++ trunk/src/layer_grp.h	(revision 19736)
@@ -257,6 +257,13 @@
 extern const pcb_dflgmap_t *pcb_dflgmap_last_top_noncopper;
 extern const pcb_dflgmap_t *pcb_dflgmap_first_bottom_noncopper;
 
+/* predefined common default map entries for building a stack */
+const pcb_dflgmap_t pcb_dflg_top_copper;
+const pcb_dflgmap_t pcb_dflg_int_copper;
+const pcb_dflgmap_t pcb_dflg_substrate;
+const pcb_dflgmap_t pcb_dflg_bot_copper;
+
+
 /* Overwrite an existing group from a default layer group map entry and create
    a layer in the group */
 void pcb_layergrp_set_dflgly(pcb_board_t *pcb, pcb_layergrp_t *grp, const pcb_dflgmap_t *src);