Wavy walls aka crinkle crankle walls go by many names, most of which would appeal to Draco Malfoy. They are also known as crinkum crankum, serpentine, and ribbon walls. In 18th century England, wavy walls were used for growing fruit. That’s why back then they were usually built East to West, so that one side would always be facing South to catch the warming rays of the sun.
They're called wythes, not layers.
But that's none of my business.