Stroke order
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Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
How it used to be written
These are the forms of 層, the traditional character: 层 is a twentieth-century simplification, found in no ancient corpus.
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Small seal script
Forms, sources and dates: the 字形演變 database of 小學堂, Academia Sinica, public domain (CC0).
Examples
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为什么这个他妈的房子没有双层玻璃，我快要冷死了。
How come this fucking apartment has no double-glazing? I'm freezing.
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你住在哪层楼？
What floor do you live on?
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因为这是一个有好几层的瀑布，所以速度慢也不会让人惊讶。
As this is a cascade with multiple layers, it shouldn't be surprising that it's slow.
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大楼有20层。
The building has 20 floors.
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我到柜台拿了钥匙，然后就乘电梯去了我房间的楼层。
After asking for my key at the front desk, I took the elevator to my floor.
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我爱千层面。
I love lasagna.
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昆虫有一层坚硬的表皮。
Insects have a hard skin.
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美国是一个自称没有社会阶层的国家。
America likes to claim that it is a "classless" society.