Ah got it! You're talking about the back side paper used in laminated doors ï basically, the decorative or protective sheet that's applied on the inside/back side of a laminated door.
PVC foil or laminate sheet (for durability and design)
Mica sheet (sun mica) for premium finishes
Balancing paper (if using high-pressure laminate on front)
Can add a water-resistant or scratch-resistant layer.
Local hardware stores, modular kitchen showrooms, or interior dcor suppliers
Price: