suffix, counter
Attaches to a number to express multiplication or multiple. Used in contexts like prices, amounts, or comparisons.
この土地の値段は十年前の三層倍になった。
The price of this land has become three times what it was ten years ago.
彼の収入は私の五層倍だ。
His income is five times mine.
倍 is the standard word for 'times' or 'double' and is more common in everyday speech. 層倍 is a more formal or emphatic suffix used with numbers.
Compound of 層 (そう, 'layer' or 'stratum') and 倍 (ばい, 'times' or 'double'). The exact historical derivation is uncertain, but the combination conveys the idea of multiple layers or multiplication.