4层PCB中间各层厚度

<p class='pull-left relative hand mr15 font14 line28' style='box-sizing: border-box; margin-top: 0px; margin-right: 15px; margin-bottom: 0px; font-size: 14px; line-height: 28px; position: relative; cursor: pointer; color: rgb(102, 102, 102); font-family: Arail, 微软雅黑; white-space: normal; background-color: rgb(255, 240, 240); text-indent: 25px; float: left !important;'><span style='font-family: sans-serif; font-size: 16px;'>这个是我的4层PCB 订单（Y150），请告知中间各层的厚度</span>